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First of all clean the platten glass, also the narrow glass to the left of the platten glass. If the lines are still there after doing a copy,open the upper left cover and look at the fuser heat roller,the lines could be from a toner contaminated heat roller,this can be cleaned with a minerised scowering pad.with the copier switched on press the Key button then # 1 1,touch Enter on the touch screen.touch HSFI tab,scoll down to copies on cru and enter, if the count is above 20,000 the fault could be the cru ( copy cartridge) needs replacing as it is not cleaning the drum.
There is not a USB port on the 425 dc. If the copier has a ESS on top of the engine ( you should see a floppy disk drive slot on the front of the copier) it means it has been converted to a 425 ST, if not it will cost a to much to convert. A xerox 425 ST will connect to a computer. Xerox ST copiers means Networked

Fault Code 15-362 - CAUTION: The Fuser Roll remains in a cammed-up position if power to the copier is interrupted while the copier is in use. The Fuser Roll will not be released from its position until the power is restored, the Power Switch is in the On position, and the Start button is pressed again. If the Fuser Roll remains in the cammed-up position for a prolonged period of time, copy quality defects will occur. To prevent damage to the Fuser Roll, switch the Power On as soon as possible after the power is restored, and make a copy of a document. If the machine is a DC 12LP send a print job from a workstation to prevent damage to the Fuser Roll.

You have to enter the customer settings, access button then 11111. Scroll around until you find the location to turn OFF the cover sheets.
You also MUST have cover sheets disables on ALL conputers connected to the machine. Somehow if someone on the network has the cover sheet turned on, it will sometimes enable it on the machine also.
It is called BANNER sheet in the memory.

The network controller used on these machines has a 2 stage power supply. The 1st stage initialises at switch on and the 2nd stage at about 75% of the boot sequence, if the 2nd stage fails then you will get the "controller unavailable" message. The answer is to replace the internal power supply for the network controller.

ok...can you scan from the front panel controls, at all? Is this a computer manager fault? Let's isolate this, shall we? you should be able to scan from buttons on front, by placing a doc on the glass, and pressing scan..